CN218514293U

CN218514293U - Plastic package power module, power module connection structure, electric drive assembly and vehicle

Info

Publication number: CN218514293U
Application number: CN202222037331.5U
Authority: CN
Inventors: 孙鑫宇; 靳满智; 袁宝成
Original assignee: Beijing Chehejia Automobile Technology Co Ltd
Current assignee: Beijing Chehejia Automobile Technology Co Ltd
Priority date: 2022-08-03
Filing date: 2022-08-03
Publication date: 2023-02-21
Anticipated expiration: 2032-08-03

Abstract

The application discloses a plastic package power module, a power module connecting structure, an electric drive assembly and a vehicle, wherein the plastic package power module comprises a substrate and a plastic package shell which is plastically packaged outside the substrate; the substrate is provided with at least three power interface areas, the plastic package shell is provided with at least three interface grooves, each interface groove is correspondingly arranged above one power interface area, and the power interface areas are exposed in the interface grooves. This application is through seting up the interface slot on the plastic envelope shell, makes the power interface district on the base plate expose in the interface slot, and the power interface district that the copper bar can the lug connection on the base plate has reduced the setting of copper lead, has reduced the parasitic inductance in the power return circuit, has also reduced the occupation space of plastic envelope power module simultaneously, does benefit to electrical system's configuration optimization.

Description

Plastic package power module, power module connection structure, electric drive assembly and vehicle

Technical Field

The application relates to the technical field of power modules, in particular to a plastic package power module, a power module connecting structure, an electric drive assembly and a vehicle.

Background

In an electric drive assembly of a vehicle, direct current provided by a storage battery is converted into alternating current for supplying power to a drive motor, and the conversion from the direct current to the alternating current is realized by arranging a power module, which is provided with three types of power interfaces including a direct current positive electrode interface DC +, a direct current negative electrode interface DC-and an alternating current interface AC. In the existing power module, such as half-bridge plastic package power, a copper lead frame is used as a power interface, so that parasitic inductance from DC + to DC-power circuit is large, and the power interface is arranged in a tiled manner, so that the occupied space is large, and the optimization of an electric control system is limited.

Disclosure of Invention

The utility model provides a power interface adopts copper lead frame tiled to arrange to lead to power return circuit parasitic inductance big and occupation space is many not enough among the prior art in overcoming, provides one kind and can reduce parasitic inductance, reduces plastic envelope power module, power module connection structure, electric drive assembly and the vehicle that the space occupied simultaneously.

The technical scheme of the application provides a plastic package power module which comprises a substrate and a plastic package shell plastic-packaged outside the substrate;

the substrate is provided with at least three power interface regions, the plastic package shell is provided with at least three interface grooves, each interface groove is correspondingly arranged above one power interface region, and the power interface regions are exposed in the interface grooves.

Further, all of the interface slots are disposed on the same side surface of the substrate.

Further, the edge of the interface slot is provided with an arc-shaped transition surface extending from the surface of the substrate to the surface of the plastic package housing.

Furthermore, the interface slot is a round-corner square slot and comprises four straight edges and two arc-shaped edges, and the two adjacent straight edges are connected through one arc-shaped edge.

Further, the power interface region at least comprises a direct current positive electrode interface region, a direct current negative electrode interface region and an alternating current interface region.

Further, the power interface region includes at least two dc positive interface regions disposed along a first straight line, at least two dc negative interface regions disposed along a second straight line, and at least two ac interface regions disposed along a third straight line, where the first straight line, the second straight line, and the third straight line are parallel to each other and disposed along a width direction or a length direction of the plastic package housing.

The technical scheme of the application also provides a power module connecting structure, which comprises the plastic package power module and at least three connecting copper bars, wherein each connecting copper bar is connected with one of the power interface regions;

the connecting copper bar is provided with at least one connecting part, and the connecting part extends into the interface slot and is welded on the power interface area.

Furthermore, the connecting copper bar also comprises a copper bar main body, the connecting part extends out of the copper bar main body, and the copper bar main body is parallel to the plastic package power module;

at least two the connection copper bar is range upon range of setting, is provided with the insulating layer between two adjacent connection copper bars.

Further, the power interface region includes at least two dc positive interface regions arranged along a first straight line, at least two dc negative interface regions arranged along a second straight line, and at least two ac interface regions arranged along a third straight line, where the first straight line, the second straight line, and the third straight line are parallel to each other;

the connecting copper bars comprise a first connecting copper bar, a second connecting copper bar and a third connecting copper bar, and each connecting copper bar is provided with at least two connecting parts;

each connecting portion of the first connecting copper bar is connected with one direct-current positive electrode interface area, each connecting portion of the second connecting copper bar is connected with one direct-current negative electrode interface area, and each connecting portion of the third connecting copper bar is connected with one alternating-current interface area.

The technical scheme of the application also provides an electric drive assembly, which comprises a storage battery, a driving motor and three power module connecting structures;

the three-phase power supply of the driving motor is electrically connected with the storage battery through the three power module connecting structures respectively;

in each power module connecting structure, the plastic package power module at least comprises a direct current positive electrode interface area, a direct current negative electrode interface area and an alternating current interface area, and the connecting copper bars comprise a first connecting copper bar, a second connecting copper bar and a third connecting copper bar;

the direct current positive electrode interface area is electrically connected with the positive electrode of the storage battery through the first connecting copper bar, the direct current negative electrode interface area is electrically connected with the negative electrode of the storage battery through the second connecting copper bar, and the alternating current interface area is electrically connected with the phase power supply of the driving motor through the third connecting copper bar.

The technical scheme of this application still provides a vehicle, includes the electric drive assembly as aforementioned.

After adopting above-mentioned technical scheme, have following beneficial effect:

this application is through seting up the interface slot on the plastic envelope shell, makes the power interface district on the base plate expose in the interface slot, and the power interface district that the copper bar can the beading on the base plate has been reduced in the setting of copper lead, has reduced the parasitic inductance in the power return circuit, has also reduced the occupation space of plastic envelope power module simultaneously, does benefit to electrical system's configuration optimization.

Drawings

The disclosure of the present application will become more readily understood by reference to the drawings. It should be understood that: these drawings are for illustrative purposes only and are not intended to limit the scope of the present application. In the figure:

fig. 1 is a schematic structural diagram of a plastic package power module in an embodiment of the present application;

fig. 2 is a schematic structural diagram of one of the power interfaces of the plastic package power module in an embodiment of the present application;

fig. 3 is a schematic structural diagram of a power module connection structure in an embodiment of the present application.

Reference symbol comparison table:

plastic package power module 100:

substrate 1: a power interface region 01, a direct current positive electrode interface region 01a, two direct current negative electrode interface regions 01b and three alternating current interface regions 01c;

plastic packaging the shell 2: the connector comprises a connector groove 02, an arc-shaped transition surface 21, a linear edge 22 and an arc-shaped edge 23;

a first connecting copper bar 200a, a second connecting copper bar 200b and a third connecting copper bar 200c

Connecting portion 3, copper bar main part 4, insulating layer 5, arc changeover portion 6.

Detailed Description

Embodiments of the present application are further described below with reference to the accompanying drawings.

It is easily understood that according to the technical solutions of the present application, a person skilled in the art can substitute various structural modes and implementation modes without changing the spirit of the present application. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical solutions of the present application, and should not be construed as limiting or restricting the technical solutions of the present application in their entirety.

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Throughout the description of the present application, it is to be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "coupled" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The foregoing is to be understood as belonging to the specific meanings in the present application as appropriate to the person of ordinary skill in the art.

Plastic packaging of the power module:

the plastic package power module in the embodiment of the present application, as shown in fig. 1 and 2, includes a substrate 1 and a plastic package housing 2 that is plastic-packaged outside the substrate 1;

at least three power interface regions 01 are arranged on the substrate 1, at least three interface grooves 02 are arranged on the plastic package shell 2, each interface groove 02 is correspondingly arranged above one power interface region 01, and the power interface regions 01 are exposed in the interface grooves 02.

Specifically, the substrate 1 is a copper-clad ceramic substrate, a power circuit is connected to the substrate to realize conversion from direct current to alternating current, and the substrate 1 and the power circuit are plastically packaged by the plastic package shell 2 to form a plastic package body for the power module, so that the internal power circuit is protected, and the integrity of the power module is also realized. In the prior art, a copper lead frame is led out from a substrate 1, and extends out of a power interface from a plastic package shell 2, so that the parasitic inductance of a power loop is increased, and the volume of a power module is increased.

The power circuit at least comprises a direct current positive electrode input end, a direct current negative electrode input end and an alternating current output end, at least three power interface areas 01 are arranged on the substrate of the embodiment of the application and correspondingly connected with two input ends and one output end of the power circuit, and the power interface areas 01 specifically at least comprise a direct current positive electrode interface area, a direct current negative electrode interface area and an alternating current interface area. The three power interface regions 01 are insulated from each other, and the three power interface regions 01 can be isolated from each other by providing an insulating region in the substrate 1.

The interface groove 02 is arranged corresponding to the power interface area 01 in the plastic package process of the plastic package shell 2, the area of the interface groove 02 is not coated with a plastic package material, the power interface area 01 is exposed in the interface groove 02, and the interface groove 02 and the power interface area 01 form a power interface of the plastic package power module. The number of the interface grooves 02 corresponds to the number of the power interface regions 01, only the power interface regions 01 of the substrate 1 are exposed on the surface of the plastic package power module, and other regions are wrapped in the plastic package housing 2.

The plastic package power module of the embodiment of the application does not need to be additionally provided with a copper lead frame, reduces parasitic inductance of a power loop, reduces the volume of the plastic package power module, and facilitates arrangement of external connecting pieces. When the external connecting piece is connected with the power interface of the plastic package power module, the external connecting piece is stretched into the interface groove 02 to be electrically connected with the power interface area 01 on the substrate 1, so that connection can be completed, and connection of the external connecting piece is not affected.

In one of the embodiments, all interface slots 02 are provided on the same side surface of the base plate 1.

The plastic package housing 2 is plastic-packaged on the substrate 1 to form a flat plastic-packaged power module, which is generally a flat rectangular parallelepiped. All interface slots 02 in the embodiment of the application are arranged on the same side surface of the substrate 1, as shown in fig. 1, the interface slots 02 are arranged on the upper surface of the plastic package power module, so that the plastic package power module can be conveniently mounted, and the external connecting pieces can be uniformly mounted on one side of the plastic package power module, thereby being beneficial to the overall layout of an electric control system.

In one embodiment, as shown in fig. 2, the edge of the interface slot 02 is provided with an arc-shaped transition surface 21 extending from the surface of the substrate 1 towards the surface of the mold housing 2.

The arc transition surface 21 spreads outward from the edge of the interface slot 02 and is annularly arranged at the edge of the interface slot 02. The arc-shaped transition surface 21 improves the holding force of the plastic packaging material on the power interface area 01 on the substrate 1, and prevents the interface groove 02 from being thicker, so that the edge of the interface groove 02 is easy to crack with the power interface area 01 under the action of external force; meanwhile, the edge of the interface groove 02 is in smooth transition due to the arrangement of the arc-shaped transition surface 21, and the appearance of the power module is optimized.

In one embodiment, as shown in fig. 2, the interface slot 02 is configured as a round-corner square slot, and includes four straight edges 22 and two arc-shaped edges 23, and two adjacent straight edges 22 are connected by one arc-shaped edge 23.

Particularly, the interface slot 02 is arranged in a square structure, can be adapted to connecting pieces such as connecting copper bars and is convenient to connect. The adjacent right-angle sides 22 are connected through the arc-shaped sides 23 to form a fillet at the corner, and compared with the right-angle corner, the fillet corner can further improve the holding force of the plastic package material at the corner of the interface slot 02 to the power interface area 01.

In one embodiment, as shown in fig. 1, the power interface 01 region includes at least two dc positive interface regions 01a disposed along a first straight line L1, at least two dc negative interface regions 01b disposed along a second straight line L2, and at least two ac interface regions 01c disposed along a third straight line L3, where the first straight line L1, the second straight line L2, and the third straight line L3 are parallel to each other and disposed along a width direction or a length direction of the plastic package housing 2.

Specifically, a plurality of power interface regions 01 are uniformly arranged on the surface of the plastic package power module in a row-column distribution manner, wherein the interfaces of the same type are arranged on the same column, and three columns of interfaces are arranged in parallel. Different types of interface regions may be provided in different numbers, for example, two dc positive interface regions 01a, two dc negative interface regions 01b, and three ac interface regions 01c may be provided. In the plastic package power module shown in fig. 1, three rows of interfaces from left to right are sequentially arranged as a dc positive interface area 01a, a dc negative interface area 01b, and an ac interface area 01c, and the positions of the rows of each type of interface can be adjusted as required.

The same type of interface regions on the substrate can be electrically connected together and can also be insulated and isolated from each other, and particularly, the power interfaces of the same type can be connected with the same external connecting piece and also can be connected with different external connecting pieces respectively according to actual requirements, for example, a connecting copper bar can be arranged to be connected with two direct-current positive-electrode interface regions 01a simultaneously, and two connecting copper bars can be arranged to be connected with two direct-current positive-electrode interface regions 01a respectively.

According to the needs, the above technical schemes can be combined to achieve the best technical effect.

Power module connection structure:

the power module connection structure in the embodiment of the present application, as shown in fig. 3, includes the plastic package power module 100 and at least three connecting copper bars 200 in the foregoing embodiment, where each connecting copper bar 200 is connected to one of the power interface regions 01;

the connecting copper bar 200 is provided with at least one connecting part 3, and the connecting part extends into the interface slot 2 and is welded on the power interface area 01.

Specifically, the external device is connected to the plastic package power module 100 through the connecting copper bar 200, and the power interface region 01 at least includes three interface regions, i.e., a dc positive interface region, a dc negative interface region, and an ac interface region, so that at least three connecting copper bars are provided to be connected to the three interface regions, respectively.

Wherein, every connection copper bar 200 sets up at least one connecting portion 3 and stretches into interface groove 02 and power interface district 01 welding, and the welding process of connecting portion 3 and power interface district 01 includes but not limited to laser welding, ultrasonic bonding etc..

In a preferred embodiment, the shape of the connecting portion 3 is the same as that of the interface groove 02, and the size of the connecting portion 3 is smaller than or equal to that of the interface groove 02, so that the connecting portion 3 is matched with the interface groove 02 to enhance the connection stability of the connecting portion 3 and the power interface region 01 and optimize the appearance effect of the connection.

In one embodiment, as shown in fig. 3, the connecting copper bar 200 further includes a copper bar main body 4, the connecting portion 3 extends from the copper bar main body 4, and the copper bar main body 4 is parallel to the plastic package power module 100;

at least two connecting copper bars 4 are arranged in a stacked mode, and an insulating layer 5 is arranged between every two adjacent connecting copper bars 4.

Particularly, the copper bar main body 4 is parallel to the connecting portion 3, the two are connected through the arc transition section 6, when the connecting portion 3 is welded on the power interface area 01, the surface of the copper bar main body 4 and the surface of the plastic package power module 100 are kept flush, and the installation space is saved to the greatest extent.

Every plastic envelope power module 100 connects three connection copper bar 4 at least, at least wherein two connect the range upon range of setting of copper bar 4, as shown in fig. 3, wherein two copper bar main parts 4 of connecting copper bar 4 are at least partly regional range upon range of together, in order to realize two insulation of connecting copper bar 4, set up insulating layer 5 between two adjacent connection copper bar 4, insulating layer 5 can be the clamp and connect between copper bar 4 two, also can be the cladding outside at least one of them connection copper bar 4, can play insulating effect can.

In the embodiment of the application, the copper bar main body 4 of the connecting copper bar 4 is parallel to the surface of the plastic package power module 100, at least two connecting copper bars 4 are arranged in a stacking manner, the occupied space of the power module connecting structure is reduced, the stacking arrangement also plays a role in mutual supporting between the connecting copper bars 4, and the connecting stability is enhanced.

In one embodiment, as shown in fig. 2, the power interface region 01 includes two dc positive interface regions 01a disposed along a first straight line L1, two dc negative interface regions 01b disposed along a second straight line L2, and two ac interface regions 01c disposed along a third straight line L3, where the first straight line L1, the second straight line L2, and the third straight line L3 are parallel to each other;

as shown in fig. 3, the connecting copper bar 200 includes a first connecting copper bar 200a, a second connecting copper bar 200b and a third connecting copper bar 200c, and each connecting copper bar 200 is provided with two connecting portions 3;

each connecting portion 3 of the first connecting copper bar 200a is connected with one dc positive interface region 01a, each connecting portion 3 of the second connecting copper bar 200b is connected with one dc negative interface region 01b, and each connecting portion 3 of the third connecting copper bar 200c is connected with one ac interface region 01c.

In the embodiment of the application, two power interfaces of each type are arranged in the plastic package power module 100, and two connecting portions 3 are arranged in each connecting copper bar 200 to be connected with the two power interfaces of the same type, so that the connecting strength between the connecting copper bar 200 and the plastic package power module 100 is improved.

Wherein, in every connection copper bar 200, two connecting portion 3 extend from the tip both sides of connecting copper bar 200 respectively to the two is located same straight line, can keep certain distance between two connecting portion 3, convenient welding.

It should be noted that three or more power interfaces of each type may also be provided in the plastic package power module 100, and the number of the connecting portions 3 on each connecting copper bar 200 is the same as that of the power interfaces of the corresponding type.

An electric drive assembly:

the electric drive assembly in the embodiment of the application comprises a storage battery, a drive motor and a power module connecting structure in the three previous embodiments;

a three-phase power supply of the driving motor is electrically connected with the storage battery through three power module connecting structures respectively;

In the electric drive assembly in the embodiment of the application, a three-phase power supply of the drive motor is connected with the storage battery through a power module connecting structure respectively, wherein a direct-current power supply of the storage battery is input into the plastic package power module through the direct-current positive electrode interface area and the direct-current negative electrode interface area, the plastic package power module converts direct current into alternating current and outputs the alternating current to one of power supplies of the drive motor from the alternating-current interface area, and three power module connecting structures are arranged to provide the alternating current for the three-phase power supply of the drive motor respectively.

Vehicle:

the vehicle in the embodiment of the present application includes the electric drive assembly in the foregoing embodiment. The vehicle in the embodiment of the present application may be a car, an SUV, a truck, a wagon, and the like, and has the technical effect of the electric drive assembly in the foregoing embodiment, which is not described herein again.

What has been described above is merely the principles and preferred embodiments of the present application. It should be noted that, for those skilled in the art, the embodiments obtained by appropriately combining the technical solutions respectively disclosed in the different embodiments are also included in the technical scope of the present invention, and several other modifications may be made on the basis of the principle of the present application and should be regarded as the protective scope of the present application.

Claims

1. A plastic package power module is characterized by comprising a substrate and a plastic package shell which is plastic packaged outside the substrate;

the substrate is provided with at least three power interface areas, the plastic package shell is provided with at least three interface grooves, each interface groove is correspondingly arranged above one power interface area, and the power interface areas are exposed in the interface grooves.

2. The plastic package power module as recited in claim 1, wherein all of the interface slots are disposed on a same side surface of the substrate.

3. The plastic package power module of claim 1, wherein an edge of the interface slot is provided with an arcuate transition surface extending from a surface of the substrate toward a surface of the plastic package housing.

4. The plastic package power module according to claim 1, wherein the interface slot is configured as a rounded square slot opening, and comprises four straight edges and two arc-shaped edges, and two adjacent straight edges are connected by one arc-shaped edge.

5. The plastic package power module according to any one of claims 1-4, wherein the power interface region comprises at least one DC positive interface region, one DC negative interface region, and one AC interface region.

6. The plastic package power module as claimed in claim 5, wherein the power interface region comprises at least two dc positive interface regions arranged along a first straight line, at least two dc negative interface regions arranged along a second straight line, and at least two ac interface regions arranged along a third straight line, and the first straight line, the second straight line, and the third straight line are parallel to each other and arranged along a width direction or a length direction of the plastic package housing.

7. A power module connection structure, comprising the plastic package power module according to any one of claims 1 to 6 and at least three connecting copper bars, each of the connecting copper bars being connected to one of the power interface regions;

8. The power module connection structure of claim 7, wherein the connection copper bar further comprises a copper bar body, the connection portion extends from the copper bar body, and the copper bar body is parallel to the plastic package power module;

9. The power module connection structure of claim 7 or 8, wherein the power interface regions include at least two positive dc interface regions arranged along a first line, at least two negative dc interface regions arranged along a second line, and at least two alternating current interface regions arranged along a third line, the first, second, and third lines being parallel to each other;

10. An electric drive assembly comprising a battery, a drive motor and three power module connection structures according to any one of claims 7-9;

11. A vehicle comprising an electric drive assembly as claimed in claim 10.